The TM21 RF radio telemetry system from Datapaq, Wilmington, MA, works with the company's TPAQ21 and MultiPaq21 data loggers to provide temperature profiling. As the loggers travel through a process (oven, furnace, or kiln), the telemetry system lets the logger transmit temperature data in real time, allowing temperature data to be viewed, analyzed, and reported. Features include the ability to operate with multiple loggers, automatic transmission frequency optimization, intelligent diagnostics, optimized transmission performance, and a modular configuration. Applications include batch oven cooking for food processing, vacuum furnace surveying for aerospace, and 3-day kiln firing for ceramics.